基于非结构网格三维有限元堤坝隐患时移特征分析

doi:10.11720/wtyht.2019.0045

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Abstract

The internal hidden danger of earth-rock dams is the main cause of dyke accidents, which seriously threatens the safety and stability of the dam. Since the hidden danger of the dam will change with the shape and size over time, it shows obvious electrical structural changes. Therefore, the real-time monitoring of the earth dam can be realized by the time-lapsing resistivity imaging method, so as to achieve the purpose of rapid warning of hidden dangers of the dam and avoid them in time. The damage is caused by hidden dangers. However, the current time-lapsing electric dam hidden danger monitoring technology is mainly based on one-dimensional or two-dimensional medium model, which cannot accurately describe the time-lapse electrical characteristics of three-dimensional dam structure. For this reason, based on high-density DC resistivity detection theory, the authors used the three-dimensional non-structural finite element numerical simulation forward modeling method to simulate the time-lapse variation characteristics of the DC electric field in a typical dam hidden danger model and analyzed the response change law. The results of time-shift monitoring have a good reflection of the trend of hidden dangers of dams. The changes in the size, location and shape of dams can cause regular changes in the amplitude and location of the monitoring. The research results of this paper can provide theoretical guidance for the anomaly identification and disaster warning of time-lapse monitoring of dams.

Key words： dam hidden danger three-dimensional unstructured finite element time-lapse monitoring forward modeling high-density electrical method

Received: 23 January 2019 Published: 15 August 2019

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	Articles by authors
	Da-Li SUN
	Xiu LI
	Yan-Fu QI
	Nai-Quan SUN
	Wen-Zhong LI
	Jian-Mei ZHOU
	Wei-Min SUN

Cite this article:

Da-Li SUN,Xiu LI,Yan-Fu QI, et al. Time-lapse characteristics analysis of hidden dangers of three-dimensional finite element levees based on unstructured grids[J]. Geophysical and Geochemical Exploration, 2019, 43(4): 804-814.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.0045 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I4/804

Tetrahedral unit (a) and dam mesh(b)

Winner device schematic

Comparison of numerical solution and analytical solution

Dam plane schematic

Schematic diagram of tubular leakage model and meshing
a—schematic diagram of the tubular leak plane;b—stereoscopic diagram of tubular leakage;c—mesh split xz profile;d—mesh split yz profile

Potential curves for tubular leaks at different diameters (a) and at different depths (b)

Time-lapse resistivity profile of tubular leaks of different diameters

Apparent resistivity profile of different buried deep tubular leaks

Layered leakage model and meshing diagram
a—plane leakage schematic diagram;b—three-dimensional schematic diagram of layered leakage;c—mesh split xz profile;d—mesh split yz profile

Potential change graph of layer thickness change(a) and depth change(b)

Apparent resistivity of thickness 0.15 m, 0.2 m, 0.25 m, 0.3 m

Apparent resistivity map of buried depth 4.5 m, 6 m, 7.5 m, 9 m

Schematic diagram of fine cracks in the dam
a—fine crack plane diagram;b—three-dimensional schematic diagram of fine cracks;c—mesh split xz profile;d—mesh split yz profile

Different tilt potential changes

Apparent resistivity profile of fine cracks at different tilt angles

Schematic diagram of the dam tube leakage monitoring curve
a— monitoring potential curve;b—peak curve

Schematic diagram of stratified leakage monitoring curve of dam
a— monitoring potential curve;b—peak curve

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